Canada balsam

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Description

A crystal clear, resinous exudate from the Canadian balsam fir, Abies balsamea, native to the northeastern United States and Canada. Canada balsam was introduced into Europe in the 18th century. It was used for a short time as a varnish, but was found to bloom in moist conditions and darken with age. Canada balsam is currently used to permanently mount microscopy specimens. Its softening point is slightly above room temperature. Canada balsam is also used as an adhesive for optical lenses.